Looking for a source of Alarm Screens, or related info

["Steve C in Seattle" <randomthinking-NOT@xxxxxxxxxxx>]

I've heard about "Alarm Screens", which are window screens with conductive
wire weaved in with the regular wire/plastic; you hook the conductive parts
up to your alarm system. The idea is that if a Bad Guy tries to enter the
premises via a screened-but-open window, tampering with the screen will
raise the alarm.

Anyone know of any internet sources for the raw material, or other forms
(custom-sized scr